Coil-insulating device.



' E. HAEFBLY.

COIL INSULATING DEVICE. APILIGATION 11.31) JULY 10, 1909. RENEWED AUG.1, 1912.

1,-12Q81 1, Patented Dec. 15, 1914;

2 SHEETS SHEET 1.

E. HAEFELY, OOIL INSULATING DEVICE.

I APPLICATION FILED JULY 10, 1909 RENEWED AUG.1,1912.

1 I 1 29,811 Patented Dec. 15

' 'SHEETSSHEET2.

Ill'll'lllllfl IIIIIIIIIII Illl 7-1-11-1:11- i iii TE him EMIL. I-IAEFELY, .OE BASEL, SWITZERLAND, ASSIGNOR. T6 VJESTING-HGUSE ELECTRIC ANDJJIANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COILJNSULATING DEVICE.

Specification of Letters Patent.

Patented Dec. 15, 1914:.

Application flied July- 10, 13,909, Serial N0. 507,003. Renewed August 1, 1912. Serial No. 712,771.

I 0 all whom it'may concern Be it. known that I, EMIL HanrnLY, a citizen of the Republic of 'Switzerland, and a resident of Basel, in Switzerland, have invented a new and useful Improvement in Coil-Insulating Devices, of which the fol lowing is a specification. I

My invention relates to the application of insulation to thecoils of'dynamo-electric machines and. other types of electric ap paratus,.and it has for its object to provide a simple device by which a particularly desirable insulating wrapping or covering may be readily applied to coils of the class above indicated after they are bent into final form.

Coils which are applied to slotted cores of dynamo-electric machines to constitute distributcd windings are usually bent or formed into final shape before they are assembled in the core slots and they are usually insulated. by wrapping a number of layers of insulating tape or ribbon around them, either manually or by means of a taping machine. A considerable amount of time and labor is consumed in this process,

particularlyif the coils arerelativelylarge,

According to my present invention, 1 provide a simple mechanism by means of which the insulating wrapping may be applied to the straight portions of a coil in a small part of the time consumedin the processes heretofore employed, and in such manner as to be held very firmly in contact with the coil itself, whereby it occupies a. minimum amount of space and, when complete, constitutes a solid mass of insula tion that is practically impervious to moisture and is capable of withstanding relatively high voltages.

It will be readily understood by those skilled in the art that the maximum insulation for a coil is required on the portions a perspective view of a device constructed in accordance with my invention, Figs. 2, 3 and at are diagrammatic views which lllustrate the operation of the device of Fig. 1,

and Figs. 5 and 6 are, respectively, a partially sectional elevation and a front elevation of the-structure shown in Fig. 1, several of the parts being broken away.

Referring to the drawings, the structure hereshown comprises a tube or hollow rod 1 having a substantially rectangular cross sec tion, brackets 52 which are secured thereto, an angle plate 3, brackets 4 secured. toi the angle plate, and spring boxes 5 which. are interposedbetween the brackets 2 and i and are adapted to force the adjacent surfaces of the members 1 and 3 toward each other.

The tube or hollow rod 1 is preferably constructed ofiron or some other heat-conducting material. The surface of the angle plate 3, which is'adjacent to the tube 1, is preferably lined with a strip 6 of wood, although any other suitable material may, be employed. Each of the brackets 2 and each of the brackets e is provided with a projection 8 which is adapted to register with a slot 9 in the top of each spring box 5, the arrangement of parts being such that the slots 9 constitute guide ways for maintaining the proper relation between the members 1 and 3 as they are adjusted toward and away from each other.

Each of the spring boxes 5 comprises a tubular outer casing 10 to which ends or heads 11 and 12 are secured, an inner rod or plunger 13 which is secured, at one end, to the bracket 2 and extends into the casmg 10 through a hole in the headll and is provided with head 1- and an intermediate tubular member 15 which is secured to the bracket 4: and extends through a hole in the end 12 into the tube 10 and is provided with a flange 16 at its free end.

A helical spring 17 is coiled about the intermediate tubular member 15 and is located between the flange 16 and the end member or head 12 and a helical spring 18 1s coiled about the rod or plunger 13 and is located between the head 14 and the head 11. The springs are both under compres- S1011 and serve to force the members 1 and 8 toward each other.

The method of utilizing the device is m dicated in Figs. 2, 3 and 4, to which special.

tion 20 of a coil is then clamped between the adjacent surfaces of the members 1 and 6 which are forcibly separated to admit the coil, a sheet of insulating fabric having been wrapped once around the coil. The insulating device is then rotated as the coil is held stationary in such a direction as to wrap convolutions of insulating fabric upon the coil.

I prefer to employ a strip of insulating fabric which is constructed of paper treated with shellac or insulating varnish and coated with overlapping pieces of sheet mica, or some similar material which may be softened upon the application of heat and fused to the adjacent layers. The tube or hollow rod 1 to which heat is applied by a bar 19 serves the purpose of softening the hinder or shellac used in manufacturing the insulating fabric, and, as the successive convolutions are wound on to the coil, the heat combined with the pressure exerted by the spring boxes 5 serves to cause the fabric to adhere to the coil and also produces, when cold, a solid insulating covering which is not injured by adverse weather conditions and which is capable of sustaining very high voltages.

I claim as my invention:

1. A device for applying insulation to electric conductors comprising a pair of pressure members, and supporting brackets rigidly secured to the pressure members and yieldingly connected to each other.

2. A device for applying insulation to electric 'conductors comprising a hollow pressure tube of rectangular section, a pres sure member cooperating therewith, a pair of supporting brackets rigidly secured to the pressure members and yicldingly connected to each other, and means adapted to be disposed within the hollow pressure memher for imparting heat thereto.

3. A device for applying insulation to electric conductors comprising a hollow pressure tube of rectangular section, a pressure member cooperating therewith, supporting brackets rigidly secured to the prc5- sure members, and spring boxes connectingthe brackets together and comprising springs that force the pressure memberstoward each other.

4. A device for applying insulation to electric conductors C(JlIlPl'lSlilg pressure them as they move toward and away from each other.

5. A device for applying insulation to electric conductors comprising a hollow pressure tube of rectangular section and heat-conducting material, a second pressure member having a plane engaging surface cooperating therewith, brackets rigidly secured to the pressure members, and telescoping spring boxes connecting the brackets and serving as guides for the pressure members as they are moved toward and away from each other.

6. A device for applying insulation to electric conductors comprising .a hollow pressure tube having a plane surface, a second pressure member cooperating therewith, brackets rigidly secured to the pressure member, and spring boxes connecting the brackets for. forcing the pressure members toward each other, each of said spring boxes comprising an outer tubular member, an intermediate tube secured to one b racket and extending into the outer tube, a rod or plunger secured to the opposite bracket and extending into the intermediate tube, a helical spring coiled about the intermediate tube and compressed between the outer end thereof and one end of the outer tube, and a second helical spring coiled about the. rod or plunger and compressed between the outer end of the rod or plunger and the opposite end of the outer tube.

7. A device for applying insulation to electric conductors comprising a pair of rigidly mounted pressure members having plane, normally parallel pressure surfaces and resilient means for subjecting the ends of the said members to substantially equal forces that tend to maintain the parallel relation of the pressure surfaces as the device is revolved about the conductor to be insulated.

8. A device for applying insulation to electric conductors comprising a pair of rigidly mounted pressure members having substantially parallel pressure surfaces, and resilient means for subjecting the ends of the said members to substantially equal forces that tend to maintain the parallel re lation of the pressure surfaces as the de vice is revolved about the conductor to be insulated.

In testimony whereof, I have hereunto subscribed my name this 8th day of July,

EMIL HAEFELY.

\Vitnesses R. J. DEARBORN, B. B. Hnvns. 

